This circuit was originally designed to measure capacitance with an ICL7107 but can be used with other digital modules. The circuit is from Electronics Now magazine from November 1996.
This test circuit was found in the PE Hobbyst Handbook in a 1990s edition. The circuit tests the...
For fans of sequential systems, here is another one found in a 1983 publication. Two CMOS...
This circuit uses the 2N626, the first commercial Darlington transistor. The transistor activates the...